He was the son of John V. O'Dea and May (Coady) O'Dea. In 1950, O'Dea married Constance Margaret (Peggy) Ewing. They had four children; Deborah (1951), Victoria (Viki) (1953), Stephen (1954) and Jane (1956).[citation needed]
In 1945, when he retired from the reserve he attended Oxford for a BCL degree and was admitted to the English Bar at the Inner Temple in 1948.
In 1949, O'Dea was made honorary aide-de-camp to the Governor General of Canada. From 1949 to 1961 he was aide-de-camp to the Lieutenant Governor of Newfoundland and Labrador. In 1963 O'Dea became Lieutenant Governor of Newfoundland and Labrador and a QC.
O'Dea was a member of the Board of Regents for MUN, Vice-President for Newfoundland at the Canadian Bar Association and a member of the Canadian Rhodes Scholarship selection committee. Fabian O'Dea was also a collector of sixteenth to eighteenth century maps of Newfoundland and Labrador.
^Poole, Cyril F.; Cuff, Robert, eds. (1993). Encyclopedia of Newfoundland and Labrador. Vol. 4. St. John's, Canada: Harry Cuff Publications Ltd. pp. 151–152 – via Memorial University of Newfoundland Digital Archives Initiative.
^"Fabian O'Dea". Canadian Heraldic Authority. Retrieved 1 September 2024.